Is it possible to remove the little dropdown arrow in a JInternalFrame?

Question

I'm using a JInternalFrame and I want to remove the dropdown in the upper left of the frame, as it serves no purpose (I've disabled resizeable, closable, etc.)

I don't see a property for this, and I don't want to remove the entire title bar, as the title is necessary. I've looked around online, and basically come up empty here. I'm hoping it's something simple that I've just overlooked, as this is my first time using JInternalFrame, and I'm not exactly a GUI kind of guy to begin with.

Answer 1

internalframe.setFrameIcon(null);

Edit: hack to remove system menu in Windows:

BasicInternalFrameUI ui = (BasicInternalFrameUI)internalFrame.getUI();
Container north = (Container)ui.getNorthPane();
north.remove(0);
north.validate();
north.repaint();

Answer 2

The relevant Icon in The Synth Look and Feel, among the Nimbus Defaults, appears to have this key:

InternalFrame:InternalFrameTitlePane:"InternalFrameTitlePane.menuButton".icon

You may be able to use the approach shown in A Synth Example to replace the Icon.