Specifies background color of the object. Color values begin with the pound symbol ( # ) and are followed by a six-digit hexadecimal code where each 2-digit code representing the amount of red, green, or blue combined to create the color. For example: #FF0000 represents red color; #00FF00 represents green color and so on.
When the color begins with '=' character, the remaining part of it is interpreted as expression. This allows you to specify dynamically calculated color instead of the color constant. For example, if you specify it as =dataset_field_val(1, 'TemplateColor'), the color value will be extracted from TemplateColor field of the report dataset. You can also use rgb function to build the color as a mix of red, green, and blue, for example: =rgb(dataset_field_val(1, 'ErrorCount'), 0, 127).