Images and text frames can lie above or below the text and in front of or behind each other since TX Text Control 18.0, which introduced a z-order and transparent text frames. The WPF TextControl received a collection of all its frames, a context menu for misspelled words and a new status bar design.

Version 18.0 was released in August 2012 as TX Text Control X8, as the press release Press Release: TX Text Control X8 (18.0) Released announced. The charts that the version added are Windows Forms chart controls: ServerTextControl and the Windows Forms TextControl handle them, and the WPF TextControl has no chart collection.

Version 18.0 at a Glance

Area	What is new
Z-order	Images and text frames above or below the text, and in front of or behind each other
Text frames	Transparency
Frames	One collection of all frames of the `TextControl`
Spell checking	Ignored and duplicate words, a context menu for misspelled words
Status bar	A color gradient, separator lines and a zoom track bar
Images	The EMF format, without an image filter

Charts in ServerTextControl

ServerTextControl can contain chart controls of the type System.Windows.Forms.DataVisualization.Charting.Chart, which is part of the .NET Framework from version 4 on.

Position. A DataVisualization.ChartFrame places the chart like an image or a text frame: as a character in the text, anchored to a paragraph or relative to the document. The frame is connected to a chart control through Chart, which holds the appearance and the data.
Collection. ServerTextControl.Charts returns a DataVisualization.ChartCollection, which adds and removes charts. The events ChartCreated and ChartDeleted report changes.
Formats. The TX Text Control format and RTF save a chart as a chart, which is rebuilt when the document is loaded. Other formats save its image. On a system without the chart controls, the image is inserted instead.

Charts and Barcodes explains why charts can't be used with the WPF TextControl today.

Z-Order and Frames

Above and below the text. The new insertion modes AboveTheText and BelowTheText put an object in front of the text or behind it. ImageCollection.Add, TextFrameCollection.Add and ChartCollection.Add accept them, as do the InsertionMode properties of images, text frames and frames.
Change the order. ChangeZOrder moves an image, text frame or chart one plane up or down, or to the top or the bottom. Objects inserted as characters always have the z-order 0.
Transparent text frames. TextFrame.Transparency takes a value from 0, opaque, to 255, completely transparent, so that objects behind the frame show through.
All frames. WPF.TextControl.Frames and ServerTextControl.Frames return a FrameCollection with all frames of the text part that has the input focus. It changes their common attributes and returns the selected frame.

Status Bar

WPF.StatusBar has a new background with a vertical color gradient and separator lines between its parts:

Zoom track bar. With ShowZoomTrackBar, the status bar shows a track bar that sets the zoom factor instead of a number.
Colors. The colors follow the Windows theme or are set through DisplayColors, a WPF.StatusBarColors object with the background colors at the top, the middle and the bottom and the colors of the separators, such as BackColorTop and SeparatorColorDark.

Rulers and Status Bar describes the status bar of the current version.

More Changes

Text parts. Two new overloads of TextPartCollection.GetItem return the offset of a text part from the top left corner of the control and the text part at a given location.
Spell checking. MisspelledWord.IsIgnored marks a misspelled word as ignored: it stays in the collection but isn't underlined. MisspelledWord.IsDuplicate tells whether the word repeats the word in front of it. MisspelledWordCollection.Ignore ignores a word, and GetCount counts the words of one kind. WPF.TextControl.SpellCheckContextMenu specifies the context menu that opens when a user right-clicks a misspelled word: a built-in default menu or one of your own.
EMF images. TX Text Control supports the Windows Enhanced Metafile format (EMF). EMF and WMF images are handled internally, so the WMF image filter is no longer needed.
Initialization. ServerTextControl.IsCreated tells whether the control has been created completely.

Upgrade to Version 18.0

MisspelledWordCollection.GetItem. The location parameter of MisspelledWordCollection.GetItem is given in pixels instead of twips.
Insertion modes. The enumerations ImageInsertionMode and TextFrameInsertionMode have the new values AboveTheText and BelowTheText.

New Classes, Properties, Methods and Events

The classes and members below are the ones that the What's New documentation of version 18.0 lists for TX Text Control .NET for WPF. Names are relative to the TXTextControl namespace, each name links to its current reference page, and "(obsolete)" marks a member that is obsolete today.

New Classes

Members by Class

Class	Properties	Methods	Events
DataVisualization.ChartCollection		Add, CopyTo, GetItem, Remove
DataVisualization.ChartEventArgs	ChartFrame
DataVisualization.ChartFrame	Chart, ExportCompressionQuality, ExportFileName, ExportFilterIndex, ExportResolution, SaveMode	AddUndoUnit, Refresh
FrameBase		ChangeZOrder
FrameCollection		CopyTo, GetItem, Remove
MisspelledWord	IsDuplicate, IsIgnored
MisspelledWordCollection		GetCount, Ignore
ServerTextControl	Charts, Frames, IsCreated		ChartCreated, ChartDeleted
TextFrame	Transparency
WPF.StatusBar	ShowZoomTrackBar
WPF.StatusBarColors	BackColorBottom, BackColorMiddle, BackColorTop, SeparatorColorDark, SeparatorColorLight
WPF.TextControl	Frames, SpellCheckContextMenu

Next Steps

Version 19.0: the features of the next version.
Version 17.0: merged table cells, page borders and digital signatures.
Text Frames and Shapes: work with text frames today.

What's New in TX Text Control .NET for WPF 18.0