New Post: Checkable legend

///<summary>///     Refreshes the custom legend based on the axes and series in the PlotModel.///</summary>privatevoid UpdateCustomLegend()
{
    uiSeriesLegendLayout.Controls.Clear();
    uiAxesLegendLayout.Controls.Clear();

    foreach (LineSeries s in PlotModel.Series.OfType<LineSeries>().OrderBy(s => s.Title))
    {
        var seriesColorButton = new Button
        {
            AutoSize = true,
            BackColor = s.Color.ToColor(),
            FlatStyle = FlatStyle.Flat,
            Size = new Size(30, 15),
            Tag = s.Tag,
            UseVisualStyleBackColor = false
        };
        seriesColorButton.Click += (sender, args) =>
        {
            using (var d = new ColorDialog())
            {
                d.Color = s.Color.ToColor();
                if (d.ShowDialog() != DialogResult.OK)
                    return;

                s.Color = d.Color.ToOxyColor();
                ((Button) sender).BackColor = d.Color;
                PlotModel.InvalidatePlot(false);
            }
        };

        var seriesVisibilityCheckBox = new CheckBox
        {
            AutoSize = true,
            Checked = s.IsVisible,
            Tag = s.Tag,
            Text = s.Title
        };
        seriesVisibilityCheckBox.CheckedChanged += (sender, args) =>
        {
            s.IsVisible = ((CheckBox) sender).Checked;
            PlotModel.InvalidatePlot(false);
        };

        uiSeriesLegendLayout.Controls.Add(seriesColorButton);
        uiSeriesLegendLayout.Controls.Add(seriesVisibilityCheckBox);
        uiSeriesLegendLayout.SetFlowBreak(seriesVisibilityCheckBox, true);
    }

    var seriesSelectAllCheckBox = new CheckBox
    {
        AutoSize = true,
        Checked = true,
        Text = "Select All"
    };
    seriesSelectAllCheckBox.CheckedChanged += (sender, args) =>
    {
        foreach (CheckBox cb in uiSeriesLegendLayout.Controls.OfType<CheckBox>())
            cb.Checked = ((CheckBox) sender).Checked;
    };

    uiSeriesLegendLayout.Controls.Add(seriesSelectAllCheckBox);

    var hideLinkedSeriesCheckBox = new CheckBox
    {
        AutoSize = true,
        Checked = false,
        Text = "Hide Linked Series"
    };

    foreach (LinearAxis a in PlotModel.Axes.OfType<LinearAxis>())
    {
        var axisVisibilityCheckBox = new CheckBox
        {
            AutoSize = true,
            Checked = a.IsAxisVisible,
            Tag = a.Tag,
            Text = a.Title
        };
        axisVisibilityCheckBox.CheckedChanged += (sender, args) =>
        {
            a.IsAxisVisible = ((CheckBox) sender).Checked;
            PlotModel.InvalidatePlot(false);

            if (!hideLinkedSeriesCheckBox.Checked)
                return;

            foreach (
                LineSeries s in
                    PlotModel.Series.OfType<LineSeries>()
                             .Where(s => s.YAxisKey == a.Key || s.XAxisKey == a.Key))
            {
                s.IsVisible = a.IsAxisVisible;
                uiSeriesLegendLayout.Controls.OfType<CheckBox>()
                                    .Single(cb => cb.Tag == s.Tag)
                                    .Checked = s.IsVisible;
            }
        };

        uiAxesLegendLayout.Controls.Add(axisVisibilityCheckBox);
        uiAxesLegendLayout.SetFlowBreak(axisVisibilityCheckBox, true);
    }

    var axisSelectAllCheckBox = new CheckBox
    {
        AutoSize = true,
        Checked = true,
        Text = "Select All"
    };
    axisSelectAllCheckBox.CheckedChanged += (sender, args) =>
    {
        foreach (
            CheckBox cb in
                uiAxesLegendLayout.Controls.OfType<CheckBox>()
                                  .Where(cb => cb != hideLinkedSeriesCheckBox))
            cb.Checked = ((CheckBox) sender).Checked;
    };

    uiAxesLegendLayout.Controls.Add(axisSelectAllCheckBox);
    uiAxesLegendLayout.Controls.Add(hideLinkedSeriesCheckBox);
}