You could custom the dialog header and append icons to the titlebar.
<eui-dialog [draggable]="true" [bodyStyle]="{width:'600px',height:'200px'}">
<eui-dialog-header>
<div class="panel-title">Dialog Title</div>
<div class="panel-tool" style="padding-right:20px">
<a href="javascript:;" class="panel-tool-min"></a>
<a href="javascript:;" class="panel-tool-max"></a>
</div>
</eui-dialog-header>
</eui-dialog>