Change grafiks/representation of cell by item attributes?

Question

Hi all. 
 
 I&acute;m trying to make a cell with custom Item types and would like to change the symbol of the cell depending on some of the custom attributes. 
 As a stupid example: My cell contains a text field and a premade cell from a cell library. the text field is connected a picklist via item types. I want to be able to select "Circle" or "Box" in the property window and have the cell change between a box and a circle. The cell library contains all necessary shapes. Is there a way to accomplish this? 
 The target is not to change between a box and a circle but some more advanced item symbols, but the principle is the same. I have a ferly good knowledge on how item types works, it is the symbol change i cant find out how to do. 
 Thanx in advance. 
 //Ante.

Jan Šlegr · Answer

Hi Andreas, 
 I agree with Jon: It cannot be done in plain MicroStation. 
 Andreas Nordlund said: I´m trying to make a cell with custom Item types and would like to change the symbol of the cell depending on some of the custom attributes. 
 In general, a conditional change from one element to another is not supported. It's possible to change parameters (size), define relationships (constrains) or to filter/modify what is displayed (using Display styles), but not to choose between more elements. 
 Andreas Nordlund said: Is there a way to accomplish this? 
 As Jon wrote: You need to write own code to monitor EC data change event and to be able to react on such change. 
 Andreas Nordlund said: I have a ferly good knowledge on how item types works 
 I dare to express my doubt, because it's one from core Item Types (and EC data in general) feature: It's only data, attached to a host element (element, model...), nothing else. It cannot control anything, it's defined structure, storing data, only. 
 With regards, 
 Jan