How to prevent popup reopen

Question

I have the below code:

<ToggleButton x:Name="toggleBtn" Content="Open Popup" /> <Popup x:Name="pp" Placement="Bottom" StaysOpen="False" IsOpen="{Binding ElementName=toggleBtn, Path=IsChecked, Mode=TwoWay}"> <Border Background="LightBlue" BorderBrush="Black" BorderThickness="1" Padding="10"> <TextBlock Text="Popup content" /> </Border> </Popup>

Current behavior: When the popup is open and I click on the ToggleButton again, the popup reopens. I don’t understand why this happens.

Expected behavior: When the popup is open and I click on the ToggleButton again, the popup should not reopen — similar to how a ComboBox behaves.

I’ve tried handling this in code-behind without binding (using the Checked and Unchecked events), and I’ve also tried handling it with the Popup.Closed event, but neither approach worked.

Palle Due · Accepted Answer · 2025-09-11 10:35:19Z

The popup does not reopen. It closes first as a result of one action and then opens again as a result of another.

This is what happens when you click the ToggleButton while the popup is open:

Event 1: MouseDown outside of the popup:
The popup handles the event because of StaysOpen="False" and begins closing.
pp.IsOpen is set to false.
TwoWay Binding sets toggleBtn.IsChecked=false .

Event 2: MouseUp over toggle button:
Nothing happens. Click event will be emitted.

Event 3: Click on toggle button:
toggleBtn.IsChecked is changed from false to true.
TwoWay Binding sets pp.IsOpen=true

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