Here you can find the source of showButtonPopupMenu(AbstractButton button, JPopupMenu popup)
public static void showButtonPopupMenu(AbstractButton button, JPopupMenu popup)
//package com.java2s; /*//from w w w . j a va 2s . c o m * Copyright 2002-2004 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ import java.awt.Dimension; import javax.swing.AbstractButton; import javax.swing.JPopupMenu; public class Main { public static void showButtonPopupMenu(AbstractButton button, JPopupMenu popup) { if (!popup.isVisible()) { Dimension size = button.getSize(); popup.show(button, 0, size.height); } } }