Styling the indeterminate state of a WPF checkbox

Question

I want to style the indeterminate state of a WPF checkbox. We have a treeview control with checkboxes, and we want the indeterminate state to represent that some descendants are

Answer 1

Another option may be to style a toggle button as it has multiple states as well. In past projects I have created custom toggle buttons with multiple states that look and function as chekcboxes. I did use blend to make the changes but in using a tggle button as the base I was able to create a more customized look and feel for the various states of the button/chekcbox. Using a toggle button can bypass a lot of the chrome related issues that are tightly boud to a standard chekcbox control.