WPF Binding to a cutom property of the template parent?

The viewmodel in all likelihood will be the DataContext, so the binding should be a RelativeSource binding with a respective path which needs to explicity target the DataContext as the new source is the RelativeSource : {Binding DataContext. IsItemSelected, RelativeSource={RelativeSource AncestorType=TreeViewItem}} As noted in my comment it might be advisable to extract this logic from the ControlTemplate as this leaves its bounds. One method would be subclassing the ToggleButton and exposing a public property for the image which then can be changed via a Style.

The viewmodel in all likelihood will be the DataContext, so the binding should be a RelativeSource binding with a respective path which needs to explicity target the DataContext as the new source is the RelativeSource: {Binding DataContext. IsItemSelected, RelativeSource={RelativeSource AncestorType=TreeViewItem}} As noted in my comment it might be advisable to extract this logic from the ControlTemplate as this leaves its bounds. One method would be subclassing the ToggleButton and exposing a public property for the image which then can be changed via a Style.

Thanks but I have no problem binding to IsChecked or even binding to the parents IsSelected property (the parent template is a TreeViewItem. Its just binding to the parent custom propert IsItemSelected which is part of my ViewModel for the TreeViewItem. – infensus Aug 2 at 1:26 1 ControlTemplates should be fully self-contained, I do not think that binding to anything outside is a good idea... – H.B.Aug 2 at 1:29 Thanks H.

B - I basically want to change the color of the expand image based on whether the property IsItemSelected is true -- any ideas? – infensus Aug 2 at 1:31 1 You could potentially subclass ToggleButton (something like ImageToggleButton) which exposes the Image's source as a public dependency property, then you can define a style for the button, which on trigger changes this property. – H.B. Aug 2 at 1:36 Ha such a simple great suggestion thanks :) Maybe post it as an answer then I can mark this as answered – infensus Aug 2 at 1:37.

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