Linear gauge scripts for start time and scale max

Hello, 

I am trying to use scripts to use a date time picker value as the start time for a linear gauge and a value box as the scale max in the same linear gauge, but I am getting errors for both. Below is the code I am using. 

Start time error: Could not get delegate of type "AxiomCore2.Events.EventDelegates+OnValueChange" for event named "LinearGauge1_OnBeginValueChange"Cannot bind to the target method because its signature or security transparency is not compatible with that of the delegate type.

scale max error: CS1061

public void DateTimePicker1_OnDateTimeChange(object sender, DateTime dateTime)
        {
            string startTime = dateTime.ToString("o");
            ValueBox1.AggregateStartTime = startTime;
            LinearGauge1.AggregateStartTime = startTime;
            LinearGauge1.ScaleMax = ValueBox2.Value?.Value;
        }