Hello Frans, Thank you for contacting National Instruments.
The Value (Signaling) property allows you to change the value of a control or indicator programmatically on the block diagram, while also generating a value-changed event that can be captured for further use in the program. The following link provides an example VI that demonstrates exactly how this property works: http://venus.ni.com/stage/we/niepd_web_display.DISPLAY_EPD4?p_guid=C22A168F95CC3450E034080020E74861&p_node=%20DZ53012&p_submitted=N&p_rank=&p_answer=&p_source=Internal You can change the Value (Signaling) property of a control from an external C program by changing the value of another control that is wired to the property. Referring to the example VI from above, if you use your ActiveX client program to set the value of Slide2, you will change the Value (Signaling) property of Slide1. You can obtain a list of available ActiveX Methods and Properties for LabVIEW by opening LabVIEW and selecting Help >> VI, Function, & How-To Help.... Run a search using keyword "ActiveX." I believe the function call you may want to use is as follows: object.SetControlValue(controlName, value) I hope this helps! Matthew C Applications Engineer National Instruments
