Modify control behavior in sub-vi

Question

I'm using a dual-slide control in several places to select a range of values. I've added behavior to the slider by forcing the value of the second slider to be greater than or equal to the first slider. I'm doing the limit calculations in a sub-vi by threading the control values through the vi. It all works fine but I've been trying to find a way to add the behavior in the Sub-VI without having to pass it back to the main. In other words, I want to add a control to a panel that has the appropriate behavior without adding the necessary code to the main diagram. I can imagine this being done by passing say a reference to the control to an appropriate sub-vi which then monitors the control and performs whatever limiting is necessary without having to wire it back to the calling VI.
There are other instances where you want to customize control behavior so I'd like to see a better way to handle this. I've tried working with contol references but to no avail.

Answer 1

Using a reference should be the answer. What was your problem with them?
Right click the terminal and select Create>>Reference, then right click the reference and select Create>>Control. Copy this control (the reference) to the subVI and have it as part of the connector pane. On the BD, wire its terminal into a property node. Since you created it from a specific control, it should give you all the properties of that control. Place the subVI on your BD and wire the reference from the original control into it and it should work. If it doesn't, I suggest you post the code.
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