@d-healey Ahaha,god，It's so simple
Feeling mine so stupid。，Thanks very much David, you solved my problem again.

@d-healey Oh, sorry, I forgot to save the latest data when I was testing the code snippet,
ChangeColor2.zip

@d-healey There is no problem switching with Combobox, but there is a problem with switching with preset browsers

@d-healey ChangeColor.zip
The code snippet didn't seem to show the problem, so I uploaded a project, and along the way I found the source of the problem. When the button is in a Panel, it causes the problem.

@d-healey Unfortunately, he still has the same result. My guess is that because I used a button to trigger the color change, when the button value does not change, it will continue to keep the button callback result.
What should I write in the else of the button to make it return to the color before it changed?

@d-healey
This doesn't seem to work, am I doing something wrong?

if (value == 2){
    for (i = 0; i < 128; i++)
          {
    		Engine.setKeyColour(i, 0x0);
    	   }

     local Ens2 = [36, 38, 40, 43, 48, 50, 52, 55, 60, 62, 64, 67, 84];		   	
           for (i = 0; i < Ens2.length; i++)
        	{
        		Engine.setKeyColour(Ens2[i], Colours.withAlpha(Colours.blue, 0.3));
        	};
         }

@d-healey The whole thing is this, I set different keyboard colors for different samplemaps, and after I used the button to change the keyboard key color, when I switched to another samplemap, the keyboard color of the previous samplemap was not overwritten, so I wanted to set the alpha value separately to avoid the problem of color not changing.

inline function onbtnEnsC1Control(component, value)
{	
	if (value){
		eventId = Synth.playNote(24, 100);
		Engine.setKeyColour(24, 0x800000FF);
	}		
	else
		Engine.setKeyColour(24, 0x500000FF);
};
Content.getComponent("btnEnsC1").setControlCallback(onbtnEnsC1Control);

samplemap1

samplemap2

In the above two pictures, C0 and G0 of samplemap2 should have no color, and C#3-G#3 should be blue, but they are not changed.

	if (value == 1){
        local Ens = [24, 25, 26, 27, 28, 29, 31, 36, 37, 38, 39, 40, 43, 44, 45, 46, 47, 86];			   	
		for (i = 0; i < Ens.length; i++)
			{
				Engine.setKeyColour(Ens[i], 0x500000FF);
			};
		local solo = [48, 50, 52, 55, 60, 61, 62, 63, 65, 66, 67, 68, 84];			   	
		for (i = 0; i < solo.length; i++)
			{
				Engine.setKeyColour(solo[i], 0x5000FF00);
			};
        }
	if (value == 2){
        local Ens2 = [36, 38, 40, 43, 48, 50, 52, 55, 60, 62, 64, 67, 84];		   	
        		for (i = 0; i < Ens2.length; i++)
        			{
        				Engine.setKeyColour(Ens2[i], Colours.withAlpha(Colours.blue, 0.3));
        			};
         }

@d-healey I just want to set the Alpha value without adding the color value

Is it possible to set the alpha of a color individually?
Instead of first var colour and then float alpha

var colour, float alpha

@ulrik Ahaha, that's a great idea!

@d-healey fine, it seems I have something to do again. Thank you very much.

I used

Message.getNoteNumber()

to control the button switch, but I also want the corresponding key on the Keyboard to respond when the button is clicked. How can I do it?

@Orvillain Wow, if there is a code snippet for me to learn, I don't know how to express my gratitude, anyway, I am looking forward to it.

@Orvillain I see. After listening to what you said, I feel that I still have a long way to go! Thank you for your answer

Like Ominisphere, select an instrument on the first channel and another instrument on the second channel... Then connect them via the MIDI tracks in your DAW.

@d-healey All right , thanks very much,I tried changing in CPP

@d-healey I used

drawAlertWindow

getAlertWindowMarkdownStyleData

but AlertWindow can only modify the Title, and getAlertWindowMarkdownStyleData cannot customize the displayed text content..

I can now draw the buttons of the dialog box, but how do I LAF the prompt words above? Please help me

"Please click below to point to the location where you've already installed the samples."

@d-healey I see，Thanks David~！

How to set the font of the prompt text and buttons in the sound library location interface?
I used the following code but it didn't work, what should I do?

Engine.setGlobalFont("myhtw17");
const laf = Content.createLocalLookAndFeel();
laf.registerFunction("drawDialogButton", function(g, obj)
{  

if (obj.text == "Select")
   {

      g.setFont("myhtw17", 12.0); 
   }
});