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well
why not use JInternalFrame if u want to create a MDI like form...create three internalframes for 3 menu buttons and on click each to get the desired internal frame....at the start sset the visible property of the internal frames to false...and on each action set it to true..
using netbeans 5.0 u can do this...in the design mode...and if u go check the properties the AccessibleParent property wud ve been set to the main frame
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