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DropDownButton closes when nested Popup closes #1400

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bozalina opened this issue Nov 2, 2018 · 1 comment · May be fixed by #1401
Closed

DropDownButton closes when nested Popup closes #1400

bozalina opened this issue Nov 2, 2018 · 1 comment · May be fixed by #1401

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@bozalina
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bozalina commented Nov 2, 2018

If you place a Popup, such as one from a ComboBox, inside a DropDownButton and click outside the nested Popup, the DropDownButton's Popup closes as well.

To reproduce, place a ComboBox inside the DropDownButton sample in the explorer:

<xctk:DropDownButton x:Name="_dropDownButton"
                               Grid.Row="1"
                               Margin="10"
                               Width="150"
                               HorizontalAlignment="Left"
                               Content="Click Me"
                               MaxDropDownHeight="{Binding Value, ElementName=maxDropDownHeight}"
                               DropDownPosition="{Binding SelectedItem, ElementName=dropDownPosition}"
                               DropDownContentBackground="{Binding SelectedColor, ElementName=dropDownContentBackground, Converter={StaticResource ColorToSolidColorBrushConverter}}"
                               Click="DropDownButton_Click">
            <xctk:DropDownButton.DropDownContent>
              <StackPanel>
                <xctk:ColorCanvas Margin="10"/>
                  <ComboBox>
                    <ComboBox.Items>
                      <sys:String>Item</sys:String>
                    </ComboBox.Items>
                  </ComboBox>
                <Button Click="Button_Click"
                        Margin="10">OK</Button>
              </StackPanel>
            </xctk:DropDownButton.DropDownContent>
          </xctk:DropDownButton>

Run the explorer and open the ComboBox. Click outside the ComboBox's Popup, but within the DropDownButton's PopUp. Observe that the DropDownButton closes as well. It seems to be caused by the PreviewMouseDownOutsideCapturedElement event tunneling through the DropDownButton's Popup to the ComboBox's Popup.
@bozalina bozalina mentioned this issue Nov 3, 2018
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@XceedBoucherS
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Thank you for reporting this.
The fix will be included in v3.8.

Dirkster99 added a commit to Dirkster99/DropDownButtonLib that referenced this issue Dec 13, 2018
@Dirkster99
https://github.com/xceedsoftware/wpftoolkit/issues/1400
26d7aae 
Checking if the mouse is outside the bounds of the DropDownButton when the PreviewMouseDownOutsideCapturedElement event tunnels through it to prevent the DropDownButton's Popup from closing if the event is caused by a child Popup
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Update ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/DropDownButto…
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@bozalina @XceedBoucherS