Custom Web Control Problem

I'm trying to desig a control for the 1st time & have this code:

Code:

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Imports System.ComponentModel
Imports System.Web.UI
Public Class WebCustomControl1
        Inherits System.Web.UI.WebControls.WebControl
        Protected Overrides Sub Render(ByVal output As System.Web.UI.HtmlTextWriter)
                output.Write("<Table height=100% width=100% border=5><TR><TD>&nbsp;</TD></TR></TABLE>")
        End Sub
End Class

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When I add this to a webform at design time, the control is locked to the right of the screen & only resizes left or vertically - I can't move it around freely or alter it's height or width like the default MS web controls (like a label or checkbox for example). How can I add this functionality please????