pb定义用户事件的说明
Defining custom user events for standard controls is not recommended. To define custom user events for standard controls, you must have some Windows SDK experience and understand the following: <br/> <br/> All standard controls respond to standard events in the range 0 to 1023. Most controls also define their own range of custom events beyond 1023 (corresponding to wm_user messages). <br/> <br/> Some controls have custom events. You need to know which controls do, because these custom events overlap with the PowerBuilder custom events (pbm_customxx). <br/> <br/> The pbm_custom01 event ID maps to wm_user+0, pbm_custom02 maps to wm_user+1, and so on, through pbm_custom75, which maps to wm_user+74. <br/> <br/> You need to make sure that you use a pbm_custom event ID that does not conflict with a custom event defined by Windows for the standard control. Otherwise, you might encounter unexpected behavior in your application. 如果使用在pb中使用api或其它的dll，可能会涉及这些问题 学习
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