How Do Override Default PopupPanel;also, Why Would App Render In Chrome but not IE

I'm trying to invoke PopupPanel using the MouseUpEvent when right-
clicking a TreeItem. When I right-click a tree item, my PopupPanel is
shown but immediately gets overwritten by an "Inspect Element"
PopupPanel firing after my own PopupPanel (thus canceling it). How do
I override the "Insert Element" PopupPanel in favor of my own
PopupPanel using the Chrome Browser? Using the Chrome Browser only,
you can see this behavior at www.StrategicInternationalSystems.com by
clicking the Signup Button and then right-clicking any TreeItem on the
WestPanel.

Furthermore, my app no longer renders at all when deployed to app
engine and accessed using IE (which definitely isn't good), but shows
up fine using the Chrome browser. I have no idea why my app renders in
Chrome, but not IE, do you?

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