Replace part of default template in WPF

Question

is there any \"best practice\" way to replace a part of the default template. The current use case is a treeview. As default, the treeview has this small triangle shapes to

Answer 1

Unfortunately, I think you have to replace the entire template:

From MSDN: http://msdn.microsoft.com/en-us/library/aa970773.aspx

Controls in Windows Presentation Foundation (WPF) have a ControlTemplate that contains the visual tree of that control. You can change the structure and appearance of a control by modifying the ControlTemplate of that control. There is no way to replace only part of the visual tree of a control; to change the visual tree of a control you must set the Template property of the control to its new and complete ControlTemplate.