| Activator | The activator class controls the plug-in life cycle. | 
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| ApplicationUI | The ApplicationUI instance holds the various images loaded from Image Descriptors and can be used as SWT Images directly, as well as other SWT allocated object such as colors. | 
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| Console | Console class with colors. | 
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| DesignerPropTester | DesignerProp tester for IIZI Module project, and others. | 
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| EditorStyleRange | Style ranges used in Editors. | 
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| ExceptionDetailsErrorDialog | A dialog to display one or more errors to the user, as contained in an IStatusobject. | 
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| ImageRegistry | The Image Registry holds information about Image Descriptors and Image instances. | 
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| InternalDatabasePreferencePage | The Designer page in the Preferences for the Internal Database. | 
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| JobRescheduler | Class that is used to resquedule all jobs but certain ones. | 
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| Preference | Class used to initialize default preference values. | 
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| ResourceTester | Resource tester for IIZI Module project, and others. | 
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| RootPreferencePage | The root page in the IIZI preferences displays the license system information. | 
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| SelectionHandler | The selection handler enabling notification of selected properties and resources using various selection types. | 
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| SplashHandler | The IIZI splash screen handler. | 
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| Startup | The start-up class for UI processing. | 
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| WorkspaceProperties | The workspace properties is used to save/restore states and settings for dialog boxes, etc. | 
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