19: Building Custom Controls in VS .NET

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19: Building Custom Controls
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Figure 196: Specify Data Type Options page showing the Field (element with custom data type) option
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contained in the data (Note that validation is lax, which means that if the schema for the namespace can be located, it will be used to validate any elements from that namespace If the schema cannot be located, no validation will occur)
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Adding an ActiveX Control That Consumes Rich Text Data
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You will notice that when you choose Field (element or attribute) as the eld or group type, there is no Rich Text (XHTML) data type as there is in the Field or Group Properties dialog for a eld If you wish to add an ActiveX control that consumes XHTML, choose Field (element with custom data type) as the eld or group type in the Specify Data Type Options wizard page For the namespace, enter the URI of the XHTML namespace: http://wwww3org/1999/xhtml
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Installing and Using ActiveX Controls
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You will notice that, in the Specify Data Type Options page, if you choose Field or Group (any data type) as the eld or group type, there are no additional options In this case, the control can be bound to any type of eld or group element in the data source You normally specify this option when you want to use a control that understands XML and will be bound to an XML subtree in the data source For the Microsoft UpDown Control, let s just accept the default options on the Specify Data Type Options page After clicking the Finish button, you ll see the Custom Control Added wizard page, which tells you that the control has been added to the Controls task pane Similar to template parts, the new control will be available in the Custom section of the Controls task pane Now you can use this ActiveX control like any other control When you insert the new control into a form template while the Automatically create data source option is selected in the Controls task pane, either a eld or a group will be created in the data source, just like when you add any of the built-in controls to your form template The type of data created depends on the options you chose in the Specify Data Type Options page when adding the custom control If you open the data source and right-click on an existing eld or group, the control may be recommended as a possible control to bind to the current data type Again, whether or not the ActiveX control is suggested depends on the data type options you speci ed when adding the control (In the case of ActiveX controls, as with template parts, when you right-click on a eld or group in the data source, the custom control may not appear in the immediate list of suggestions You may have to click on the More menu item to nd the custom control you want)
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Property Pages Once you insert an ActiveX control into a form template, the next logical thing you will probably want to do is customize various properties of the control When working with built-in controls in InfoPath, you re used to opening the properties dialog for a control to customize various aspects of the control, such as size, conditional formatting, and even the screen tip for the control Customizing properties for an ActiveX control is no different If you open the properties dialog for an ActiveX control, you will see the familiar Data, Display, Size, and Advanced tabs However, you may notice something different Some ActiveX controls have additional tabs in their
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19: Building Custom Controls
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Figure 197: Properties dialog for the Microsoft UpDown Control
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properties dialogs If a control exposes custom property pages to allow you to customize the control, InfoPath will include those property pages in the control properties dialog For example, Figure 197 shows the properties dialog for the Microsoft UpDown Control This control exposes three additional property tabs General, Buddy, and Scrolling that enable you to customize various aspects of the control
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