Opening Execution Modeler 
Execution Modeler provides an intuitive modeling environment for developing Web Dynpro applications. Using this modeler, it is possible to model both execution and navigation flows.
In the Execution Modeler both the Execution and Navigation mode is selected by default. If you want to view only one mode at a time deselect the appropriate checkbox.
You have opened the Web Dynpro Perspective in the SAP NetWeaver Developer Studio.
Open Web Dynpro Explorer.
Expand node.
In the Components node, select a window.
In the windows context menu, choose .