How to Make 3-button Hidden?

All other buttons can be hidden using command modifiers, eg. @hidenosel:type=*.wav. I'm trying to make a 3-button that only shows up when .wav files are selected. Is there any way to accomplish that?

Edit: Attaching my button in this post.

<?xml version="1.0"?>
<button backcol="none" display="both" icon_size="large" label_pos="bottom" textcol="none" type="three_button">
	<label>Play</label>
	<icon1>#play</icon1>
	<button backcol="none" display="both" hotkey="shift+alt+f11" icon_size="large" label_pos="bottom" textcol="none">
		<label>Play</label>
		<tip>Play currently selected sound (.wav) files</tip>
		<icon1>#play</icon1>
		<function type="normal">
			<instruction>@hidenosel:type=*.wav</instruction>
			<instruction>@nodeselect</instruction>
			<instruction>Play STOPALL</instruction>
			<instruction>Play {allfile} QUIET</instruction>
		</function>
	</button>
	<button backcol="none" display="both" icon_size="large" label_pos="bottom" textcol="none">
		<label>Play</label>
		<tip>Stop all currently playing audio</tip>
		<icon1>#play</icon1>
		<function type="normal">
			<instruction>@hidenosel:type=*.wav</instruction>
			<instruction>@nodeselect</instruction>
			<instruction />
			<instruction>Play STOPALL</instruction>
			<instruction />
			<instruction>// Also stop any playing audio stream in fmedia* by forcefully</instruction>
			<instruction>// killing its process and any child processes started by it.</instruction>
			<instruction>// (*I use fmedia to play any audio files other than .wav files)</instruction>
			<instruction>@runmode:hide</instruction>
			<instruction>taskkill /IM fmedia.exe /T /F</instruction>
		</function>
	</button>
</button>

There isn't currently a way to make three-buttons hidden conditionally. Splitting the two actions on it into two separate normal buttons would work, though.

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