Netbeans MDI - Hide InternalFrame

Hello,

first of all: i´m a newbie in Netbeans GUI Programming (Swing). I work with
Java 6 (1.6.0_04) and Netbeans 

6.1.

Yesterday i tried to create a litle MDI-Application and what a surprise - it
was really easy. So i delete 

the project and created a new one with the same properties. But no i have a
problem.

Here what i did:

1)
New -> New Project

2)
Java -> Java Desktop Application

3)
Basic Application

-> The Project is created.

Because i want a MDI-Project i put "Desktop Pane" with Drag&Drop onto the
mainPanel (JPanel).

After that i put a "InternalFrame" onto the "Desktop Pane".

Now i want a menu with 2 items. One for closing the InternalFrame and one
for opening the InternalFrame. 

So i created 2 menuitems and assigned 2 actionEvents->actionPerformed.

In the close-Menu i put the code:
jInternalFrame1.hide();


In the open-menu i put the code:
jInternalFrame1.show();


That was it. So i run the project. And if i click the menuitem to close the
form, first of all nothing is 

happening. But when i resize the main-form (mainpanel) with the mouse - the
internalframe is blanked out.

When i click the menuitem to show the internalframe - everything is working
fine.

But in my first project this was working. I can´t remember that i made
anything else. What made i wrong? 

Where is my mistake?

My project looks like:
http://www.nabble.com/file/p17045029/netbeans.jpg 

Can someone help me please?

Best regards
Heidi





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