Or maybe you could set the prompt text to be left aligned instead of centered and then that could make it a little easier to give the help button its own space, something like this:
code:
<html>
<body class="commandbody">
<div class="commandheader" style="text-align:left; margin-bottom:0.5em;">
<hbox style="align-items:center">
<flex style="flex-shrink:1;">
<div id="StartPrompt" class="commandprompt">Pick start point more text more</div>
<div id="EndPrompt" class="hiddencommandprompt"><moi:Text textid="Line end point prompt"/></div>
</flex>
<div>
<moi:LabelButton onclick="moi.ui.alert('Help text here...');"><img src="moi://ui/icons/HelpIcon.png" style="width:2em;"/></moi:LabelButton>
</div>
</hbox>
</div>
<moi:CheckButton id="bothsides"><moi:Text textid="Line both sides checkbox"/></moi:CheckButton>
<moi:CommandCancel />
</body>
</html>

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