Application Express :: Possible To Detect Status Of Hide / Show Region

Is it possible to detect the status of Hide / Show Region.

I have three hide/show regions RX,RY,RZ. When an event EX happens, then region RX should expand and the rest of the region should collapse. When an event EY happens, then region RY should expand and the rest of the region should collapse.
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We can use this JS on DA to change the status of a region:

$("RX.uRegionControl").click();
$("RY.uRegionControl").click();

.....But, first we need to detect the status to know where to apply that DA. ? I am working on apex 4.2. theme 25.