rem: fPreferences = preferences;
add: fPreviousFrame = Frame();
context: WorkspacesWindow::WorkspacesWindow(WorkspacesPreferences *preferences)	: BWindow(preferences->WindowFrame(), "Workspaces", B_TITLED_WINDOW_LOOK, 			B_NORMAL_WINDOW_FEEL, B_WORKSPACES_WINDOW | B_AVOID_FRONT, B_ALL_WORKSPACES){	fPreferences = preferences;}