#599 A way to show Popup manually

[jebberwocky]

An utility method Clients.pop(Popup p) which allows developers display a popup or menupopup component.

[Tom M. Yeh]

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user_id=91099
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Ready since 10/18
--
The popup method is added to org.zkoss.zul.Popup.
(x, y) can be retrieved via MouseEvent.

[Tom M. Yeh]

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user_id=91099
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Test codes:
<zk>
<button label="test" onClick='editPopup.popup("100", "50")'/>
<menupopup id="editPopup">
<menuitem label="Undo"/>
<menuitem label="Redo"/>
<menu label="Sort">
<menupopup>
<menuitem label="Sort by Name" autocheck="true"/>
<menuitem label="Sort by Date" autocheck="true"/>
</menupopup>
</menu>
</menupopup>
</zk>

[Tom M. Yeh]

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user_id=91099
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The method is nenamed to open() and there are two signature. Refer to Javadoc of org.zkoss.zul.Popup