How to set visible or enabled in DialogWindow?

When you call Dialog.AskExt() you can indicate a method to call to initialize the dialog. So each PXAction button can initialize itself the way that you need.

WebDialogResult result = TheViewUsedToShowTheDialog.AskExt(InitializationMethod1, true);
if (result == WebDialogResult.OK)
{
...
}


private void InitializationMethod1(PXGraph graph, string name)
{
  //set up your virtual DAC field visibility and field values here for the first configuration
}

private void InitializationMethod2(PXGraph graph, string name)
{
  //set up your virtual DAC field visibility and field values here for the second configuration
}

You should also be able to use a RowSelected event handler for the DAC which the dialog is bound in order to control the UI.