In an MDI frame, users can open windows (sheets) to perform activities.  For example, in an electronic mail application, an MDI frame might have sheets that the users open to create and send messages, read messages they have received, and reply to these messages.  All the sheets can be open at the same time and the user can move among the sheets, performing different activities in each sheet.

To open a sheet in the client area of an MDI frame, use the OpenSheet function in a script for an event in a MenuItem, an event in another sheet, or an event in any control in the frame.  In the OpenSheet function, you can specify how the sheet will be opened:

Cascaded	Displayed with the other open sheets.  The sheets are arranged so they overlap and all the title bars are visible
Layered	Displayed the size of the workspace.
Original	Displayed the size it was built.

TIP:   You should not Open a sheet from within the Open event for a sheet.