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Opening a ToolTip programmatically

Hi all,

how can I open a ToolTip attached to a Control programmatically?


11 Answers Found


Answer 1


try this.



<Button Content="Button" Height="23" HorizontalAlignment="Left"Name="button1">


                <ToolTip Content="this is a button"></ToolTip>






((ToolTip) button1.ToolTip).IsOpen = true;


Best of luck

Md. Masudur Rahman

Answer 2

Hello Masadur,

I tried my very best, but your proposal does not open the ToolTip. I think that we must look in the direction of raising a RoutedEvent against the ToolTip. But I have no idea what this could be.


Answer 3


In which event you are trying to display the tooltip? I have tested it and work fine.  




Answer 4

Hi Masudur,

very nice pages on Tooltips. My compliments to this great job. I did these studies myself and know how difficult that matter is.

In my case here, I'm looking for a solution to open a ToolTip that has been already created and assigned either in XAML or C# by programming and not by hovering the mouse over the attachee (e.g. the TextBox or the Button). I have understood your message above that you proposed to open the ToolTip by sending true to the IsOpen property of the ToolTip. This does not work here, I'm afraid, and I have not found an example for this in the samples in your site.

The Event approach I mentioned has the following design idea:

Any of the MouseOver and other hover events is captured by the base Control and either converted to an event signaling the ToolTip to open itself or the ToolTip is created and shown by the base Control. So basically we would simulate a MouseOver.


Answer 6

Hi Brian,

I have some experience with adorner. This would be a possible alternate solution.

The requirement I have to implement is a little more "ToolTip"-based because the programmed Open of the ToolTip should occur with different texts in the ToolTip as an explanation of the content of the TextBox immediately when the Text is entered and the user tabs away from the TextBox. After then the ToolTip should close after its defined time and appear again on request be hovering with the mouse over the TextBox later on.

Everything works well with the ToolTip except the programmed Open. There seems to be no method or property that triggers an open. I tried IsOpen and some other.

So my idea is to raise the event against the TextBox that leads to opening of the ToolTip. I have nothing found on this in MSDN yet. The most promising candidate seems to be the ToolTipOpening event.

I'm sure that the WPF experts will have better ideas.


Answer 7

Luckily for you I am a WPF expert.  If I understand you correctly you want the tooltip to stay visible as you type.  Is this correct?  If so, what you need is the StaysOpen property.

<Grid><Grid.RowDefinitions><RowDefinitionHeight="Auto"/><RowDefinitionHeight="Auto"/></Grid.RowDefinitions><TextBoxx:Name="_textBox"><TextBox.ToolTip><ToolTip><TextBlockText="This is a tooltip"/></ToolTip></TextBox.ToolTip></TextBox><StackPanelGrid.Row="1"Orientation="Horizontal"><ButtonClick="OpenButton_Click">Show Tooltip</Button><ButtonClick="CloseButton_Click">Close Tooltip</Button></StackPanel></Grid>


privatevoid OpenButton_Click(object sender, RoutedEventArgs e)
      ((ToolTip)_textBox.ToolTip).StaysOpen = true;
      ((ToolTip)_textBox.ToolTip).IsOpen = true;

    privatevoid CloseButton_Click(object sender, RoutedEventArgs e)
      ((ToolTip)_textBox.ToolTip).StaysOpen = false;
      ((ToolTip)_textBox.ToolTip).IsOpen = false;

This basic example works perfectly.  I click the Show button and start typing, the tooltip stays visible.  It will only dissapear when I click the close button.


Answer 8

Hi Brian,

good to hear that you can help with best WPF expertise. So your example was very helpful.

Your solution does not fully covered my requirements described in my posting above (... After then the ToolTip should close after its defined time and appear again on request be hovering with the mouse over the TextBox later on .), but it showed how to open a ToolTip by my own code. Very helpfull, indeed.

I had to adjust things a little:

Because the default Placement is "Mouse" the ToolTip appeared at the button clicked, not attached to the TextBox where it belongs to. Clearing StaysOpen in the IsOpen = false clause lead to a "NotSupported" exception when hovering over the TextBox after closing the ToolTip manually.

To cure the placement problem, I added a Placement Property in XAML. After this the isOpen clause no more worked. The reason turned out to be the need for setting PlacementTarget Property when other placements than Mouse are specified. BTW: This was the reason for my original question: I was using a Placement Property of Bottom from the beginning and so IsOpen did not work.

So my final setup in C# (XAML as show by Brian) is as follows:

private void OpenButton_Click( object sender, RoutedEventArgs e ) {
  ((ToolTip)_textBox.ToolTip).Placement = PlacementMode.Bottom;
  ((ToolTip)_textBox.ToolTip).PlacementTarget = _textBox;
  ((ToolTip)_textBox.ToolTip).IsOpen = true;

private void CloseButton_Click( object sender, RoutedEventArgs e ) {
  ((ToolTip)_textBox.ToolTip).IsOpen = false;

Setting the Placement should be better done in XAML because there it is set when instantiating the ToolTip.

So everything is up to my needs except one important topic: The Tooltip should close automatically after the ShowDuration time (see above). I tried setting this with ToolTipService in XAML and in C# as an attached property: No success.

So this is my new problem : How can I activate the TollTip closing after the ShowDuration time when it has been opened by the IsOpen pattern?

Regards Uwe

Answer 9

Using the exmaple I provided; I get the desired effect by setting the TooltipService.ShowDuration property.  I am sure you will find that the tooltip will not always behave as you expect it to when trying to manipulate it's behavior programattically.  You may need the help of a timer and hide the tooltip manually.  As I mentioned earlier, I believe an adorner would be a better solution to your problem.  Good luck.


Answer 10

Hello Brian,

I tried my very best to reproduce what you wrote, but the ToolTip opened by IsOpen refused to disappear after the ShowDurationTime. Could you please have a look at the code below to guide me where the difference is?


<Windowx:Class="PamToolTip.ToolTipWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase"Title="MainWindow"Height="350"Width="525"><Grid><Grid.RowDefinitions><RowDefinitionHeight="Auto"/><RowDefinitionHeight="Auto"/></Grid.RowDefinitions><TextBoxx:Name="_textBox"Margin="20"ToolTipService.ShowDuration="1000"ToolTipService.Placement="Bottom"><TextBox.ToolTip><ToolTip><TextBlockText="This is a tooltip"/></ToolTip></TextBox.ToolTip></TextBox><StackPanelGrid.Row="1"Orientation="Horizontal"Margin="20"HorizontalAlignment="Stretch"><ButtonHeight="40"Margin="0 0 10 0"Click="OpenButton_Click">Show Tooltip</Button><ButtonHeight="40"Margin="0 0 10 0"Click="CloseButton_Click">Close Tooltip</Button></StackPanel></Grid></Window>
Code behind
namespace PamToolTip {
  publicpartialclass ToolTipWindow : Window {

   public ToolTipWindow() {

   privatevoid OpenButton_Click( object sender, RoutedEventArgs e ) {
     TextBox textBox = this._textBox;
     ToolTip toolTip = (ToolTip)textBox.ToolTip;
     ((ToolTip)textBox.ToolTip).PlacementTarget = textBox;
     ((ToolTip)textBox.ToolTip).IsOpen = true;

   privatevoid CloseButton_Click( object sender, RoutedEventArgs e ) {
     ((ToolTip)_textBox.ToolTip).IsOpen = false;

Could it be that I have a bug in my .Net 4?


Answer 11

I don't think you have a bug in your .NET.  The tooltip just isn't meant to be used the way you are using it.  You may eventually get it close, but I still think an adorner is a better solution.  Good luck.


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