Use the following sample code to reproduce the issue:

LineSeries series = new LineSeries();
series.ValueMember = "Value";
series.CategoryMember = "Category";
this.radChartView1.Series.Add(series);

DataTable table = new DataTable();

table.Columns.Add("Category", typeof(int));
table.Columns.Add("Value", typeof(int));
double value = 100;

for (int i = 0; i < 1000; i++)
{
    value += rnd.Next(-3, +4);

    table.Rows.Add(i, value);
}

series.DataSource = table;

this.radRangeSelector1.AssociatedControl = this.radChartView1;