| Button | 
 The Button class represents a button in a gui. 
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| CheckBox | 
 A checkbox is a small box which, can be checked or unchecked. 
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| ComboBox | 
 A Combobox holds different entries. 
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| Control | 
 abstract class Control - The base class for all gui elements
 Each element has an absolute position, which is defined by the upper left corner. 
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| Image | 
 A object of this class is used to show an image. 
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| Label | 
 Label is used to show some text. 
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| Labeled | 
 Abstract class Labled - A class for all components having a label (Button, Checkbox, Label) 
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| ListView | 
 A ListView contains objects line by line
 
 events: itemSelected, itemEdited 
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| PasswordField | 
 A passwordfield is a special textfield. 
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| ProgressBar | 
 A linear control which is used for indicating progress. 
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| ProgressIndicator | 
 A circular control which is used for indicating progress. 
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| RadioButton | 
 A radio button can be checked or unchecked. 
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| RadioButtonGroup | 
 A radio button group can contain multiple radio buttons. 
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| Separator | 
 A horizontal or vertical separator line. 
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| Slider | 
 A slider ist used to select a numeric value  from a continuous or discrete range. 
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| Spinner | 
 A single line with an up and down arrow, that let you select a number or an object. 
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| Table | 
 A table 
 
 events: cellselected, cellEdited, contentChanged 
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| TextArea | 
 A text area  can contain multi-line text
 
 events: confirmed, selectionChanged, contentChanged 
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| TextComponent | 
 A abstract class for all text components
 
 events: confirmed, selectionChanged, contentChanged 
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| TextField | 
 In a textfield you can put one single line of text. 
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| Video | 
 The Video class represents a video in the gui. 
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