Write OnGetCustomElem event handler to set formatting at the location of custom tag. 

ItemIndex - specifies index of currently parsed item; 

TagIndex - specifies index of custom tag in the item; 

You may set next formatting parameters: 

ImageIndex - specifies image to be placed at this position; 

StyleIndex - specifies new style which will be used starting from this position; 

Text - specifies text to be placed at the given position. 

Note: It is possible to define all parameters simultaneously. 

TComplexRender Events