I have a simple question: Does anybody know how to resize an internal frame by its sides on MacOS? Setting the resizable flag to true makes it resizable by the bottom right corner, but not by holding it anywhere else along the edges of the window. This problem does not occur in the windows operating system, and an internal frame can be resized by placing the cursor on anywhere along its edges. I suspect that this is an issue that is related to Java System Library implementation on the MacOs, but I can't tell which class handles internal frame resizing. Any suggestions are welcome.