i found the answer as below
Hi Co2r.
The HScrollBar appear because once the VScrollBar displayed, it hasn't enough space to show it. So you can set the Padding property of the FlowLayoutPanel to give it enough space. In the property window of FlowLayoutPanel, find the Padding property, extend it, set the Right sub-property of it to 20 for example. Now, you won't see the HScrollBar.
Hint, if you start a thread to ask a question, don't set its type to "General Discussion".
Sincerely,
Kira Qian
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i set the right sub property to 20 or even 100.. still the horizontal scrollbar appear.