IntervalSelector

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private IntervalSelector intervalSelector;
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private DependencyObject LoadXAML()
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{
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    // Note: pageContent (not demonstrated in this example) is the page content of the XAML
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    // Find the Interval selector
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    intervalSelector = LogicalTreeHelper.FindLogicalNode(pageContent, "intervalSelector") as IntervalSelector;
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    if (intervalSelector != null)
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        intervalSelector.IntervalChanged += OnIntervalChanged;
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}
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// This method is fired when our interval selector changes intervals
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private void OnIntervalChanged(object sender, BarsPeriodEventArgs e)
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{
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    if (e.BarsPeriod == null)
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        return;
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}
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/***IIntervalProvider** member. Required if you want to use the interval linker mechanism on this window.
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No functionality has been linked to the interval linker in this sample.*/
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public BarsPeriod BarsPeriod { get; set; }
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// NOTE: Don't forget to clean up resources and unsubscribe to events
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// Called by **TabControl** when tab is being removed or window is closed
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public override void Cleanup()
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{
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    // Clean up our resources
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    if (intervalSelector != null)
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        intervalSelector.IntervalChanged -= OnIntervalChanged;
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    base.Cleanup();
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}