Drag a pane from the Panes palette and drop it on a main window or a custom dialog.
If you want the paned window to span the top of the parent window, drop the pane on the top-left corner of the parent. The pane will be attached to the window at its left and top margins with an offset of 0.
Resize the pane, if necessary.
If you want the paned window to span its parent window, drag the right edge of the pane beyond the right edge of the window. The pane will be attached to this edge, also.
Drag one or more additional panes to the main window or dialog and drop them on an unoccupied portion of the window.
Select all panes that you want to be part of the paned window.
Use mouse button 1 to select one pane and mouse button 2 to select additional panes.
Choose Make Paned Window from the Layout menu or from the interface or Module Browser pop-up menu (displayed by pressing mouse button 3).
The paned window will be created.
If one of the panes is attached to the right (East) edge of its parent and one or more of the other panes are not attached to the right edge of the parent, the right edge of the panes not attached to the right edge will be attached to the right edge. A message dialog box will be displayed, explaining that the children of the paned window have different East attachments and that the East attachment has been set to that of the rightmost pane. You can adjust the right attachment in the Attachments Editor. Click OK.