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I have also updated your Telerik points.
Currently, the possible solution that I can suggest is to invalidate RadGanttView after changing the GanttViewElement.GraphicalViewElement.TimelineStart property.
Dim
count
As
Integer
= 1
Private
Sub
RadButton1_Click(sender
As
Object
, e
As
EventArgs)
Handles
RadButton1.Click
Me
.RadGanttView1.GanttViewElement.GraphicalViewElement.TimelineStart = DateTime.Now.AddDays(count)
Me
.RadGanttView1.GanttViewElement.GraphicalViewElement.InvalidateMeasure(true)
Me.RadGanttView1.GanttViewElement.GraphicalViewElement.UpdateLayout()
count = count + 1
End
Sub