Wpf datatemplate does not binding property value

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I have one group box with header should display a text with button in xaml. setting visibility of Header button using IsbtnVisibility property defined in my viewmodel.

IsbtnVisibility

is bool property. when it is false the button should collpase but it is not working as expected. Is there any way to solve it.

What I have tried:

<GroupBox Grid.Row="0" Padding="3,5,3,3">

                                              <GroupBox.HeaderTemplate>
                                                  <DataTemplate>
                                                      <StackPanel Orientation="Horizontal" >
                                                          <TextBlock Text="Sample Header " FontWeight="Bold"/>
                                                          <UserCntrl:RoundedButton x:Name="btnRoundedButton" Visibility="{Binding Path=IsbtnVisibility,Converter={StaticResource FalseToCollapsedConverter}}"/>
                                                      </StackPanel>
                                                  </DataTemplate>
                                              </GroupBox.HeaderTemplate>
                                              </GroupBox>

Posted 8-Oct-18 21:19pm

kida atlantis

Updated 9-Oct-18 6:03am

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2 solutions

Solution 1

Do you see a BindingExpression error being displayed in the Output Window when you execute your project in Visual Studio?

c# - WPF Error 40 BindingExpression path error: property not found on 'object' - Stack Overflow[^]

If Yes, that is probably something you want to look into fixing.

If No, You can use a Boolean to Boolean converter in the binding that you are having trouble with. Just set a breakpoint in the converter to see the actual values being passed forth and back between view and data source...

WPF Tutorial | Debug DataBinding Issues[^]

Posted 8-Oct-18 22:32pm

Dirk Bahle

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kida atlantis 9-Oct-18 5:37am

I could not see any errors at output window. I am using same property value and bool to control visibility converter.The same logic is working fine but where as groupbox with header the same logic not working fine.

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Richard Deeming · Accepted Answer · 2018-10-09T06:03:00

The HeaderTemplate has its own DataContext, so you can't bind directly to properties on the parent DataContext. If you examine the output window, you will see errors telling you that the property was not found.

You need to use a RelativeSource binding to access the parent DataContext:

<UserCntrl:RoundedButton x:Name="btnRoundedButton" 
    Visibility="{Binding Path=DataContext.IsbtnVisibility,
    RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type GroupBox}}, Converter={StaticResource FalseToCollapsedConverter}}"
/>

WPF GroupBox HeaderTemplate and DataBinding - Stack Overflow[^]