The classic windows OpenFileDialog/OpenFolderDialog - just as yours - consists of two areas:
- The tree on the left, containing "This Computer" as well as all the hard drives, etc. and
- The contents of the currently opened folder on the right
While in the classic windows OpenFileDialog it is possible to just select eg. the hard drive "E:\" on the left side (the tree) and hit okay, in yours it is not possible because the left side seems to be only for navigation, but not for selection.
So to select the "E:\"-Drive in your dialog, I first have to select "This Computer" in the tree on the left, so its contents (read: hard-drives) are shown on the right side. Only then I'm able to select the drive on the right side.
This does not conform with the usual behaviour.
So my question is: Are you going to fix it or am I missing an option alá "CanSelectFromTree" or whatnot.