dynamic show/hide a panel using LayoutPanel

Hi there,

With LayoutPanel and its family components, I find it very difficult to show/hide dynamically a panel in the middle of the screen. 

I have the following layout vertically.  I need to show/hide MessagePanel depends on whether there is a message for user. If message panel is hidden, the body will fill up its space. Otherwise, the body will show after the message. But, I am having real trouble to do that.

<HeaderPanel>

<MessagePanel>

<BodyPanel>

The reason is because all LayoutPanel require explicitly specifying size and height, etc. 

The following is what I come up with, but the problem is, after I set my message panel to be visible, it does not push down the content panel underneath it, the message is overlapping with the content. 

Any suggestion?  I could use FlowPanel or HTMLPanel, but that will prevent me from using DockLayoutPanel in the UI body, which is what I need to show a 50/50 split.

Yan

<g:LayoutPanel>

<g:layer height='30px'> 

<g:Widget ui:field="header" />

</g:layer>

<g:layer top='31px' height='30px'> 

<g:Widget ui:field="messageBox"/>

</g:layer>

<g:layer>

<g:SimpleLayoutPanel ui:field="body" />

</g:layer>

</g:LayoutPanel>

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