How do i display a child form - Dev Express parent Ribbon Form

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C#3.0

C#

I'm using Dev Express.

I would like to display a child form on a Ribbon Form whose property [isMdiContainer=True]


My c# code is as follows:

XtrafrmClients ch_clients = new XtrafrmClients();
ch_clients.MdiParent = this;
ch_clients.Show();

With this code, there is no exception but I can't see the child form.
I tried to get the output of:
string x = this.hasChildren.to string()
and the result is true.

Please help.