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Even though this Color Picker window is created by the OS API, it does not expose any properties or methods to the programmer. All the window handling is done in the LV core entirely. I won't suggest using ChooseColor or its .NET wrapper as I'm pretty unsure how to accomplish the task of mouse tracking there (maybe LPCCHOOKPROC callback function could be of some use, but it would require writing a DLL anyway). It would be much easier to create your own color picker SubVI with some means of interaction with the main VI. You can find some color chooser examples on NI forums, e.g. this one.