Well... the first thingy:
1. you must to "Fill" the "Use" Field of the Report Controls
2. Use the "SETTARGET()" to lead the correct band of the report where your target control is. vgr. Header, Detail, etc...
3. Change the picture as regular Prop:text, or color... or font... or position... etc.
4. issue an empty "SETTARGET()" for regular operation.
The Second Thingy:
Use the Buildin variable: Report$YourVariable{Prop:yourproperty} = Your Value to override the Settarget command....
best regards
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carabez@hotmail.com