To conditionally control the TextBox
item width, you can either:
1. Set the TextBox width in a Event
as you have tried. Unfortunately you have set the width to a report definition item instead to a processing one. Check out the following help articles:
Report Life Cycle
2. Set the width property with a Binding
to an User Function
as shown in following code snippet:
Public Shared Function RunTimeWidth(value As String) As Telerik.Reporting.Drawing.Unit
Return Unit.Pixel(CDbl(value) * 100)
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