Updated basic controls docs

Author: jsuarezruiz

docs/Controls/Calendar.md

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+# Calendar
+
+Displays a calendar and allows the user to select a **date**.

docs/Controls/ColorButton.md

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 # ColorButton
 
- The **ColorButton** is a button which displays the currently selected color and allows to open a color selection dialog to change the color. 
+ The **ColorButton** is a button which displays the currently selected **color** and allows to open a color selection dialog to change the color. 
 
 ![](../../images/colorbutton.png)
 

docs/Controls/ColorPicker.md

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+# ColorPicker
+
+Control for choosing **color**.

docs/Controls/DataGrid.md

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+# DataGrid
+
+Control for displaying **data in rows and columns**.
+
+Features:
+
+- Strong integration with the Xamarin.Forms binding mechanism.
+- Configurable row height.
+- Configurable column widths.
+- Customizable colors.

docs/Controls/DateTimePicker.md

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+# DateTimePicker
+
+Allows the user to select a **date and time**.

docs/Controls/Expander.md

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+# Expander
+
+A container which can **hide** its **child**.

docs/Controls/FileButton.md

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+# FileButton
+
+A button to launch a **file selection dialog**.

docs/Controls/FontButton.md

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+# FontButton
+
+A button to launch a **font selection dialog**.

docs/Controls/GridSplitter.md

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+# GridSplitter
+
+A control that **redistributes space** between columns or rows.

docs/Controls/HyperLinkButton.md

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+# HyperLinkButton
+
+A button bound to a **URL**.

docs/Controls/ImageCheckBox.md

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+# ImageCheckBox
+
+Toggle button with **images** for every **state**.

docs/Controls/ScaleButton.md

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+# ScaleButton 
+
+A button which pops up a **scale**.

docs/Controls/Separator.md

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+# Separator
+
+A **separator** control.

docs/Controls/StatusBar.md

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+# StatusBar
+
+Report messages of minor importance to the user. Maintain a **stack of messages**.The message at the top of the stack is the one that will be displayed.

docs/Controls/TextEditor.md

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+# TextEditor
+
+Text **editor** control.

docs/Controls/ToggleButton.md

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+# ToggleButton
+
+Button with **states**. The button will remain "pressed state" when clicked. Clicking again will cause the toggle button to return to its "normal state".

docs/Controls/TreeView.md

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+# TreeView
+
+A control for displaying **trees**.