I am trying to customize a work item template and need to add a field which can capture hierarchical data.I am using TFS power tools to edit work items. I tried to create a new field with datatype as TreePath but when I save it, it throws an error: TF26179 – Field Type 'TreePath' can be used only with System.AreaPath & System.IterationPath
Is there any workaround to use the TreePath control for custom fields?
This should be duplicated with this thread : TFS 2013: Custom TreePath Fields.
Just as the error message mentioned the Field Type 'TreePath' can be used only with System.AreaPath & System.IterationPath.
So, Tree Path is not supported for other fields for now, and there is a user voice submitted to request the feature, you can vote it or submit a new user voice to suggest the feature.
For custom control, you can reference the source code of the vsts-extension-color-control