{if !$previewMessageFieldID|isset}{assign var=previewMessageFieldID value='text'}{/if}
{if !$previewButtonID|isset}{assign var=previewButtonID value='buttonMessagePreview'}{/if}
{if !$previewMessageObjectType|isset}{assign var=previewMessageObjectType value=''}{/if}
{if !$previewMessageObjectID|isset}{assign var=previewMessageObjectID value=0}{/if}