Sets the vertical alignment of the thumbnail for self.
If the page is so tall that classTabOverview can't display it completely
and has to crop it, vertical alignment will determine which part of the page
will be visible.
For example, 0.5 means the center of the page will be visible, 0 means the
top edge will be visible and 1 means the bottom edge will be visible.
Sets the vertical alignment of the thumbnail for self.
If the page is so tall that classTabOverview can't display it completely and has to crop it, vertical alignment will determine which part of the page will be visible.
For example, 0.5 means the center of the page will be visible, 0 means the top edge will be visible and 1 means the bottom edge will be visible.
The default vertical alignment is 0.