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Once you have placed controls onto your designer (which you will do in a moment), you can then make use of the Properties window to set property values for the selected control, as well as rig up event handlers for the selected control. By way of a simple test, drag a button control anywhere on your visual designer. Once you do, you will see that Visual Studio authored XAML similar to the following:

<Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="12,12,0,0" Name="button1" VerticalAlignment="Top" Width="75" /> Now, use the Properties window to change the Background color of the Button using the integrated brush editor (Figure 27-20).

For most forms, the ID is created by the convention module name plus an identifier describing what the form does. For example, the user login form is created by the user module and has the ID user_login. Drupal uses the form ID to determine the names of the default validation, submission, and theme functions for the form. Additionally, Drupal uses the form ID as a basis for generating an HTML ID attribute in the <form> tag for that specific form, so forms in Drupal always have a unique ID. You can override the ID by setting the #id property: $form['#id'] = 'my-special-css-identifier'; The resulting HTML tag will look something like this: <form action="/path" "accept-charset="UTF-8" method="post" id="my-special-css-identifier"> The form ID is also embedded into the form as a hidden field named form_id. In our example, we chose formexample_nameform as the form ID because it describes our form. That is, the purpose of our form is for the user to enter his or her name. We could have just used formexample_form, but that s not very descriptive and later we might want to add another form to our module.

Note The Brush Editor of Expression Blend is very similar to the Visual Studio brush editor and will be examined in detail in 29.

Figure 27-20. The Properties window can be used to configure the UI of a WPF control Once you have finished tinkering with the brush editor, check out the generated markup. It might look something like this: <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="12,12,0,0" Name="button1" VerticalAlignment="Top" Width="75"> <Button.Background> <LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5"> <GradientStop Color="#FF7488CE" Offset="0" /> <GradientStop Color="#FFC11E1E" Offset="0.837" /> </LinearGradientBrush> </Button.Background> </Button> If you wish to handle events for a given control, you can also make use of the Properties window, but this time you need to click on the Events tab. Ensure that the button is selected on your designer, click on the Events tab, and locate the Click event. Once you do, double click directly on the Click event entry. This will cause Visual Studio 2010 to automatically build an event handler that takes the form:

One of the interesting aspects of System.String is that once you assign a string object with its initial value, the character data cannot be changed. At first glance, this might seem like a flat-out lie, given that we are always reassigning strings to new values and because the System.String type defines a number of methods that appear to modify the character data in one way or another (such as uppercasing and

Often, you want to split your form up into different fieldsets the form API makes this easy. Each fieldset is defined in the data structure and has fields defined as children. Let s add a favorite color field to our example: function formexample_nameform() { $form['name'] = array( '#title' => t('Your Name'), '#type' => 'fieldset', '#description' => t('What people call you.') ); $form['name']['user_name'] = array( '#title' => t('Your Name'), '#type' => 'textfield', '#description' => t('Please enter your name.') ); $form['color'] = array( '#title' => t('Color'), '#type' => 'fieldset', '#description' => t('This fieldset contains the Color field.'), '#collapsible' => TRUE, '#collapsed' => FALSE ); $form['color_options'] = array( '#type' => 'value', '#value' => array(t('red'), t('green'), t('blue')) );

test: Evaluates an expression and returns success or failure if: Executes a set of command if a list of commands is successful and optionally executes a different set if it is not case: Matches a word with one or more patterns and executes the commands associated with the first matching pattern while: Repeatedly executes a set of commands while a list of commands executes successfully