Call the function like this:

<code lang="Java">

     lockMinSize(500,  400);

</code>

The function:

<code lang="Java">

        // Locks minimum frame size
	protected void lockMinSize(int nWidth, int nHeight)
	{
		// Declare variables
		final int nX = nWidth;
		final int nY = nHeight;

		// Add listener
		this.addComponentListener(new ComponentAdapter()
		{
			public void componentResized(ComponentEvent event)
			{
				setSize((getWidth() < nX) ? nX : getWidth(), (getHeight() < nY) ? nY : getHeight());
			}
		});
	}

</code>