Add Expand and Collapse buttons in some dialog windows such as "Element Templates Manager", "Text Styles" dialog, etc..

Autodesk Civil 3D has 2 buttons (Expand and Collapse) in some of its dialog boxes such as "Parameters" tab in its Corridor Properties. See attached image.

I would like to see similar buttons in some dialog windows in MicroStation such as the "Element Templates Manager", "Text Styles", "Dimension Styles", etc... basically where there is DGNLib Libraries in a tree structure.