1. A computer program product for use in a computing system that may render a displayed object using corresponding rendering elements specified in any one of at least three tiers of rendering instructions, the computer program product comprising one or more computer-readable media having thereon computer-executable instructions structured such that, when executed by one or more processors of the computing system, cause the computing system to perform a method for the computing system to generate a web page based on a rendering priority mechanism of the at least three tiers of rendering instructions, the computer-executable instructions comprising: computer-executable instructions for generating a control object associated with a web page definition representing the second tier of rendering instructions; computer-executable instructions for causing the rendering priority mechanism of the at least three tiers of rendering instructions to be applied, wherein properties associated with the control object in the first tier of rendering instructions are always applied to the control object, wherein properties associated with the control object in the second tier of rendering instructions are applied to the control object if the properties in the second tier of rendering instructions do not conflict with the properties in the first tier of rendering instructions, and wherein properties associated with the control object in the third tier of rendering instructions are applied to the control object if the properties in the third tier of rendering instructions do not conflict with the properties in the first and second tiers of rendering instructions.