Hi I am using dhtmlxGrid_v14_Pro_70813 professional version,

>>Is there a way to get editor object

Current active editor grid.editor

>>Set value of active editor

In most case it will be available as grid.editor.obj ( but not in all , this is not strict rule )
grid.edotor.obj.value=“new text”;

>>I want to set color of "someItemNumber"

You can access html node of cell as


and do any direct manipulation with HTML
More complex approach - creating custom exCell, where you can define as item will look in normal and edit states as well as formatting|coloring rules or custom methods.