[TIMOB-920] setHeight not working properly for popovers

see:
http://helpdesk.appcelerator.net/tickets/2335">http://helpdesk.appcelerator.net/tickets/2335

if the popover is visible and i chance the height, it will not be reflected until the popover is hidden then shown again.

here's a test case:

var win = Ti.UI.createWindow();

var b0 = Ti.UI.createButton({
    top:10,
    width:300,
    height:40,
    title:'Open Popover'
})

var b1 = Titanium.UI.createButton({ 
    width:129, 
    height:29, 
    top:12, 
    left:63, 
    title:'button 1'
});

var b2 = Titanium.UI.createButton({ 
    width:105, 
    height:29, 
    top:12, 
    left:192, 
    title:'button 2'
});

var b3 = Titanium.UI.createButton({ 
    width:114, 
    height:29, 
    top:12, 
    left:297, 
    title:'button 3'
}); 

var popover = Ti.UI.iPad.createPopover({ 
    title:'Popover',
    width:480, 
    height:156,
    arrowDirection:Ti.UI.iPad.POPOVER_ARROW_DIRECTION_UP,
    backgroundColor: '#fdf5e5'
}); 
popover.add(b1);
popover.add(b2);
popover.add(b3);

win.add(b0)

b0.addEventListener('click', function()
{                   
    popover.show({view:b0, rect:{x:230,y:350}});    
});

b1.addEventListener('click', function()
{
    popover.setHeight(156);
});

b2.addEventListener('click', function()
{   
    popover.setHeight(320);
});

b3.addEventListener('click', function()
{   
    popover.setHeight(320);
});
win.open();