The AddAttribute(x, opts) calling sequence adds attributes to a previously constructed element.  This is an advanced feature.  No post-processing is performed. Therefore, shortcuts cannot be used.

The AddAttribute command must be used on constructed elements prior to a call to the Maplet command and can only be used directly on objects to which it is applied.

$\mathrm{with}\left({\mathrm{Maplets}}_{\mathrm{Elements}}\right)\:$

$b≔\mathrm{Button}\left(''Hello''\,\'\mathrm{onclick}\'\=\'\mathrm{A1}\'\right)$

$b≔\mathrm{Maplets}:-\mathrm{Elements}:-\mathrm{com.maplesoft.maplets.elements.MButton}\left(''caption''=''Hello''\,''onclick''=''REF''\left(''A1''\right)\,''enabled''=''true''\,''visible''=''true''\,''valign''=''center''\,''halign''=''center''\right)$

${{\mathrm{Maplets}}_{\mathrm{Tools}}}_{\mathrm{AddAttribute}}\left(b\,\'\mathrm{reference}\'\=\'\mathrm{B1}\'\,\'\mathrm{color}\'\=''\#FF00FF''\right)$

$\mathrm{Maplets}:-\mathrm{Elements}:-\mathrm{com.maplesoft.maplets.elements.MButton}\left(''reference''=''B1''\,''color''=''\#FF00FF''\,''caption''=''Hello''\,''onclick''=''REF''\left(''A1''\right)\,''enabled''=''true''\,''visible''=''true''\,''valign''=''center''\,''halign''=''center''\right)$