1. Drag out the ContextMenuBar control on the form, right-click "Add Context Menu", "buttonItem1" is displayed in the space, select "buttonItem1", and right-click to Add the control;
2. Modify control attributes;
3. Select the control that you want to bring up the context menu on top, select Properties, double-click the ContextMenuEx option on "conenxtMenuBar1", or click the drop-down list to select the control. If you cannot select one, double-click it.
4. If there are multiple right-click menus, select the corresponding menu. You must manually modify the settings when you cannot select one. In "InitializeComponent ()", find the control to add the right-click menu and add code (eg: this. contextMenuBar1.SetContextMenuEx (this, this. buttonItem1);) the control name is modified according to its own name.
5. Right-click each project to add a function.