Different Types

Group	Represents a protected region that users cannot edit or delete. This is not a control for grouping other content controls.
	Can contain other content controls plus other word objects, tables, graphics etc
	can be used to group content controls together and other document content to protect it from editing or deletion.
	allows you to protect an area of the document without having to apply protection to the whole document
	Can contain other content controls although problems found when adding no editable content controls into groups and then PDF'ing
	provides an easy way to protect document content when it is combined with editable custom controls
	when you hover over a group with the mouse the area will be highlighted
	when the cursor is placed insode a group control a border is displayed around the area
Rich Text	Formatting can be saved by loading, saving or closing the document. Use for short paragraphs. There are no restrictions
	can contain text in multiple styles
	can contain other content controls
	Microsoft.Office.Tools.Word.RichTextContentControl
Text	Limited to content that has no formatting. Only plain text. The format is determined by the formatting around the content control
	can only contain text in one style
	cannot contain other content controls
	Microsoft.Office.Tools.Word.PlainTextContentControl
Picture	Fills the control with a single picture
	Fills the content control with a single picture. Limits formatting changes to picture brightness and contrast.
	Can display pictures in several different formats
	cannot contain other content controls
Combo Box	Contains a list that you can edit. Formatting can be saved by saving or closing the document
	Can be arbitrary text or a value selected from a drop-down
	can only contain text in one style
	cannot contain other content controls
Drop-Down List	Contains a list of restricted choices
	Contains a list of restricted choices defined by the template. Text is restricted to a single paragraph with no formatting. no restriction on the number of items
	can only be a value selected from a drop-down
	can only contain text in one style
	cannot contain other content controls
Date Picker	Contains a calendar control, limits text to a single paragraph
	Can be arbitrary text or date selected from a drop-down date picker
	can only contain text in one style
Building Block Gallery	Shows a gallery of formatted designs Use this to specify a set of cover pages, headers, page designs or other building blocks from the Quick Parts gallery
	allows the user to choose a specific building block Shows a gallery of formatted choices.
	can contain text in multiple styles
	can contain other content controls
	can select items from a drop-down that displays items from existing galleries built-in to Word or from custom template
CheckBox	(Added in 2013) - If this control is opened up in Word 2007 it is displayed in a RichText control
	There is no CheckBoxContentControl type
	To create a checkbox you need to use:
	this.Controls.AddContentControl("name",Word.wdContentControlType.wdContentControlCheckBox);
Repeating Section	(Added in 2013)

Properties

Text - get or set the text that is displayed in the control
PlaceholderText - get or set the temporary text that is displayed in the control until a user edits the control
Title - get or set the title that is displayed in the border of the content control when the user clicks on it
Temporary - remove the control from the document automatically after the user edits the control. The text in the control remains in the document
LockControls - prevents users from editing the control
LockContentControl - prevents users from deleting the control

Events

Entering - ContentControlOnEnter - runs when the user clicks in the content control or when the cursor is moved into the content control programmatically.
Exiting - ContentControlOnExit - runs when the user clicks outside the content control or when the cursor is moved outside the content control pgrammatically
Added - ContentControlAfterAdd - runs when the content control is added to the document as a result of a redo or undo operations.
Deleting - ContentControlBeforeDelete - runs just before the content control is deleted from the document