Multiple Document Interface (MDI)

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Practically, the first frame of your application is used to handle the background window and creates a new sub-application object with the "MDI Child Window" option each time it wants to create a new child window. An MDI application can also have docked toolbars, this is done with sub-applications with a Docked option.

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Apologies for noob quest - anyone actually used MDI option and used sub-apps (or frames) to make toolbars and floating panels? - how do I open and close these sub-apps? Is there a tutorial?

Thanks