Home / Community & Support / Developer Productivity Tools Forums / Silverlight > Expander > Binding to IsChecked property of checkbox

• Deepak Shakya

  Posted on Oct 18, 2011 (permalink)

  Hi,
  
  

  • I have bound the IsExpanded property of the expander to the IsChecked property of the checkbox usign Element property binding in Blend.
  • When it starts, it works fine. i.e. when I check the box, it expands and collapses when checked off.
  • But then I Collapse the box manually. The binding is now broken. Checking the checkbox or checking is off has no effect on expand/collapse of the expander. I am using one-way binding. I cannot use two-way binding as I do not want to check off the checkbox when the expander collapses.

  
  Any help is appreciated.
  
  Cheers.

  Reply

• Petar Mladenov Petar Mladenov

  Posted on Oct 20, 2011 (permalink)

  Hello Deepak Shakya,

   This is not a problem of the RadExpander, it's just the way the Binding works. Once you expand the Expander programmatically, the one way binding won't work. You can examine the same behavior with 2 CheckBoxes:

  <CheckBox x:Name="cBox1" Content="chB1" IsChecked="{Binding ElementName=cBox,Path=IsChecked}" />

   

              <CheckBox x:Name="cBox" Content="CHeckBox" />

  So you need a custom check/uncheck cinchonization that cannot be done with Bindings only. You need to use Checked/Uncheck events ( Expanded/Collapsed of the Expander) in order to achieve the desired functionality.Best wishes,
  Petar Mladenov
  the Telerik team

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